Pollutant Concentrations

Air quality readings will be available hourly from 7am to 11pm. Air quality readings from 12am to 6am will be made available at 7am on the same day.

Readings on 09 Dec 2014

View reading for:

Region

24-hr Sulphur dioxide(µg/m3)

24-hr PM10(µg/m3)

1-hr Nitrogen dioxide(µg/m3)a

8-hr Ozone(µg/m3)

8-hr Carbon monoxide(mg/m3)

24-hr PM2.5(µg/m3)

North

6(4)

22(22)

35(-)

32(13)

0.2(2)

11(45)

South

4(3)

25(25)

37(-)

30(13)

0.4(4)

12(51)

East

8(5)

21(21)

17(-)

37(16)

0.4(4)

13(52)

West

3(2)

24(24)

20(-)

45(19)

0.4(4)

12(49)

Central

10(6)

22(22)

47(-)

41(17)

0.5(5)

10(43)

1-hr PM2.5 (µg/m3)b Readings on 09 Dec 2014

View reading for:

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

North

8

17

14

11

10

8

9

10

8

7

12

15

South

8

11

9

10

11

6

12

12

14

18

22

22

East

16

14

8

12

13

17

13

7

15

11

14

18

West

21

12

8

7

9

14

9

11

13

13

16

19

Central

9

14

6

9

10

7

7

17

13

13

9

14

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

North

12

16

16

13

11

13

13

7

7

6

7

-

South

18

20

22

12

12

14

10

7

4

5

4

-

East

10

13

11

11

10

20

13

15

9

15

15

-

West

18

11

9

7

12

12

8

12

8

11

9

-

Central

6

13

7

8

13

16

8

9

10

15

7

-

Note:a Sub-index for nitrogen dioxide is reported only when the 1-hr concentration equals or exceeds 1130 µg/m3.

b There is no sub-index for 1-hr PM2.5.

3-hr PSI Readings from 1am to 12am on
09 Dec 2014

Time

1am

2am

3am

4am

5am

6am

7am

8am

9am

10am

11am

12pm

3-hr PSI

46

48

46

43

40

42

42

43

46

50

52

54

Time

1pm

2pm

3pm

4pm

5pm

6pm

7pm

8pm

9pm

10pm

11pm

12am

3-hr PSI

54

54

53

52

48

51

51

49

39

39

37

-

Hourly updates of 3-hr PSI readings are provided from 7am to 11pm. The 3-hr PSI readings from 12am to 6am will be made available at 7am on the same day. The 3-hr PSI readings are calculated based on PM2.5 concentrations only.